原句意为：金属,就如前面所陈述过的那样,有着许多好的特质
as has been stated before 是个非限制性定语从句.
as 代替整个主句“金属有着许多好的特质”这回事,作主语,谓语是陈述,一看就知道是被动关系；再从 before一关键词就可看出“完成”这一概念,故从句用现在完成时
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Metals have many good properties,as has been stated before.
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